Flow meter and the like



FLOW METER AND THE LIKE Filed 001:. 25. 1922 2 Sheets-Sheet 1 ll lll lI: In L a! a 59 Irn/entorn Hamocl H. M/ pelsolen,

b JdJZ Y Jan. 29 9 1924- H. H. MAPELSDEN FLOW METER AND THE LIKE FiledOct. 25 1922 2 Sheets-Sheet a In\ entor-: Harold H. Ma.

pelsden,

His Attorney.

hatented den. 2%, 192d.

HAMLD E. mmsnnn, F SCHENECTADY, NEW YOEK'ASSIGNQE T0 is ERIC ACOBPOBA'QIQI} OF NEW YQRK.

snow METER AND THE EH3.

Applicattcnflled mm at, ma. Serial 11b. teases.

' lng instruments such as flow meters and the like which measure apressure difierenoe by the use of a til-tube containing a suitableliquid. As is well understood, the difiering pressures being applied tothe indicat' two legs or the U-tuhe causes a deflection of the liquidroportional to the amount of pressure di erence.

The amount of the deflection in the respective legs of a U-tube dependsupon their relative cross sectional areas. If they have the same area,the deflection in each will be the same. 'That is, with a totaldeflection of the indicating li uid of one inch, the liquid in one legwil be lowered one-half as inch and the liquid in the other leg will beraised one-half inch. On the other hand, if the area of one leg is.twice that of the other, then with a total deflection of one inch, therewill be a deflection of one-third inch in the lar er leg and two thirdsin the smaller le hus it will be seen that by varyin t e relative areasof the two legs of a tube, any percentage of the total deflection may beplaced in one leg. Usuall M it is not total deflection which is measurbut the deflection in'one leg only and under these circumstances thepressure diflerence represented by a certain deflection in one leg of aU-tube depends u 4 amount of the deflection an the relative areas ofthetwo legs of the U-tube. It fol lows, therefore, that by varying therelative area of. the two legs of a U-tube, the instrument may beadapted for diflerent pressure at difierenw ranges.

The object of my invention is to provide an improved tl-tube structurefor use in flow meters" and the like in which the relative areas of thetwo legs of the U-tube can be i at easilyl ehanged so as to adapt theU-tum struetiirefer use with various pressure ditterenee ranges and fora consideration ct n both the 26 having with apinion 28. Pinion 28 isfixed on a what Ibelieve'to be novel and my inventhereto.

In the drawing, Fig. 1 is a rear view partly in section, of anindicating instrument or U-tube, embodyin my invention; Fig. 2 is adetail sectiona view taken on line 22 Fig. 1; Fig. 3 is a top 'lan viewof the block shown in section in ig. 2 and the adjacent portion of thehousin Fig. 4 is a. transverse sectional view; an Figs. 5 and 6 areviews of U-tube legs adapted for use in my instrument.

' Referring to the drawing, 10 indicates a base upon which is mounted atube 11, the upper end of which is enlarged to form a housing 12 havingan o en top closed by a cover plate 13. The ower end of tube 11 isclosedby a plug 14. Formed inte al with tube 11 adjacent its lower and is tillan arm; 15 which projects beyond the confines of housing 12 and isprovided with an upturned end 16 on which is a flat boltin flange 17. Inarm 15 is a passe. e 18 which communicates with tube 11. astened toflange 17 on arm 15 is a tube 19 which forms the other leg of theUf-tube. It is fastened in position-b bolts 20, a suitable packing 21being provi ed to seal the joint. In the bottom of tube 19 is a passage22 which communicates with The two tubes 11 and 19 are thus incommunicationl at their lowerends by. we of passages 18 and 22. Tube 19is clo at its upper end and connected to such end is a pressure pipe 23.lntubes 11 and 19 is a suitable indicating liquid 24.

For indicatingthe deflection of the liquid in tube 11 a float 25 isprovided which rides on the liquid and is provided with a stem a rackportion 27 which meshes shaft 29 mounted in suitable bearings 39. On thefront. end of shaft 29 is a permanent magnet 31 and opposite it outsidethe casin is a second permanent ma et 32 mounted to turn in bearings 33.T e portion 34 of the housing wall between the ma nets is made ofnon-magnetic material.

'l he two magnets are thus magneticall cou led together so that magnet32 l to ow the passage 18 in arm 15.

movements of magnet 31. Connec to megnet 32 is a. pointer 35 which movesover e suiteble scale on a. scale plate 35. Scale plate 35 is fastenedto housing 12 by bolts 35, Fig. 1) and forms a pert of a housing close be glazed cover 35. It will be understoo thet magnet 32 may. actuateother mechanisms besides or in .licu of inter 35., such us, for example,an integrating attachment or e recording attecent, the use of suchdevices being well known in this 'art. The mechenisni shown is to betaken us typicei of any suitable mechanism which it is desired to hoveopereted by the dost.

Stem 2% passes through guide arms 36 end its upper end is accommodatedby a tubuisr proiection 37 on cover piste 13. At 38 is e gui e post forthe cover plate.

(in one side of housing 12 is a block 39 tested by bolts t0. In block 39is a recess 4&1 to which is connected pressure pipe 23 deiso epressnre'pipe 42-which extends sure pipe to which extends to the source to thesource of pressure diderence to be meesuted. 11in block 39 is e secondrecess t3 connected by e pesscge st to the interior ct housing 12 end bye pessege to to a. presof pressure difierence to be meosured. Forone-mp1s, in the once of e flow meter, pressure'pipes 42 end it extendto the two sides of at pressure didercnce erecting device which createsa reassure difierence which beers n definite reetionto the rote of flow.Recesses ti end 43 ere connected by at cross posse 4-7 which is normellyclosed by avcive t8e Wmen velve 48 is seed pressure pipes in end t6 ereconnects togetherthus short-circuiting the U-tuhe end permitting theindicsting liquid to goto zero. This is useful in setting the U-tuhe forzero.

In use, the U-tube is tilted with indicating fluid to such it ievei thstwith the some pressure in the two iegs oi the h-tuhe, the indicetinscele. Tie pressure pipes 42 and i6 ere connected to the source ofdiderentiel pressure. Either pipe niey he comes if to the point athigher ressure depending. upon the errengement cfthe instrument. In-the[iii present instance it is intended that pi e :8 be coected to thehigher pressure or coding pressure end pipe 42 to the lower pressure ortroiiing pressure. With this errengement when n ressure difierenceoccurs the ievei of the in iceting iio uid in tube 11 ii iii be loweredand that in tube. it raised.

Fioet wiii move downwerd with the level oi the iiquid in tube 11 therebyturning shaft 2% end megnet 81 through the inter= niediory of rock t?end pinion 2%., Magnet will ioiicw the movements of mugnet 31 thus.nioving pointer 35 to indicste the mount oi the deflection of theindicnting iiquid in tube 11. In the nose ct chow teeter is weiiunderstood;

pointer stands at zero on theinmost diderenw set up by the ressuredifiierence erecting device hears a. efinite relation to the rate offlow of the fluid being metered and hence pointer 35 will indicate rateof flow of fluid being metered in any suitable t6 M2,:

As to. its'mode of operation, this instrument is similar to others ofthis enerel type es used in flow meters and t e like and us is clear,the portion of the deflection of the indicating liquid which is measuredis that which occurs in tube 11 end the amount of this ortion of thedeflection is proportional tot e respective areas of tubes 11' and 19.It is oftendesireble to adopt the same instrument for use with differentpressure difirence ranges which can be best done by cheng'in therelative cross of the two legs of the -tuhe. With my improved instrumentthis is accomplished by chsnging the leg 19. To do this this it is oniynecessary to take out boits 20, remove e line of instruments they comrise the tube .11 end its ussocietcd mechenism and two or more tubes 19of various sizes each of which is adopted to be connected with tube 11end its associated mechenism to mehe o complete instrument. In Fig. 5 19indicates the detachable U-tube of Figs. 1 end 2, end in Fig.- 6, 19indicetes' encther leg of e difierent size which many he substituted forit.

It will be noted thot in my innruinent oil the mechanism ectusted bydost 25 is essccieted directly with hi-tube leg 11 end is not disturbedby chenging U-tube 'ieg 19.

in eccordenoe with the provisions of the potent stetutes I havedescribed the principie of operetion of my invention to gether with theeppsretus which I new con sider to represent the best embodimentthereof, but i desire to heve it understood that the eppuretus shown isonly iiiustretive end the invention may be curried out by other menus.

at I cieini es new end desire to secure by Letters Potent eat the UnitedSto es 28,-

1. in e pressure-responsive instrument for use with dew-meters end thehits, the combinetion of c hose, u tube mounted verticeiiy thereon, enenierged cesium integral its its

the tube ct its upper end "orining s it??? housing, flow meter mechanismin said housing, an arm extending from a point on the tube adjacent itslower end, said arm being hollow and upturned at its outer end toprovide a seat, and a second tube detachably connected. to said seat andcommunicating with said first-named tube through the hollow arm, saidtubes and hollow connecting arm forming a il -tube,

2. In a pressure-responsive instrument for use with flow-meters and thelike, the combination of a base, a seat on the base, a tube mounted onthe seat, said tuhe hav, ing an enlarged upper end forming a housing, amovable rod in the housing, a float in the tube connected with the rod,a liquid in the tube on which the float rests, an arm extending from thetube adjacent its lower end, said arm having an upturned end providedwith a seat, a second tube detachably mounted on the seat, the am havinga passage therein connecting the tubes whereby liquid from thefirst-named tube fills the passage and assumes a level in thesecond-named tube, providing a U-tube.

3. In a pressure-responsive instrument for use With flow meters and thelike, the combination of a base, a tube mounted on said base, said tubehaving an enlarged upper end forming a housing, an. arm extending fromthe tube adjacent to its lower end, said arm having a surface at itsfree end which presents a seat, a second tube detachably connected tosaid seat and extending parallel to the first-named tube, said armhaving a passage connecting said tubes to form a til-tube, andindicating mechanism associated entirely with said first-named tube andSaid housing, whereby said secondnained tube may be replaced withoutdisturbing the indicating mechanism.

In witness whereof I have hereunto set any hand this 24th da of October,1922.

HAROLD MAPELSDEN.

